ngx-parallax-scroll
Version:
This is a simple angular plugin, that allows us to implement parallax effect for some element in page
320 lines • 27.5 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
import { Directive, ElementRef, Renderer2, Input, Inject, PLATFORM_ID } from '@angular/core';
import { isDevMode } from '@angular/core';
import { isPlatformServer } from '@angular/common';
import { fromEvent } from 'rxjs';
import { throttleTime } from 'rxjs/operators';
export class ParallaxScrollDirective {
/**
* @param {?} elem
* @param {?} renderer
* @param {?} platformId
*/
constructor(elem, renderer, platformId) {
this.elem = elem;
this.renderer = renderer;
this.platformId = platformId;
this._parallaxTimingFunVal = 'linear';
this._parallaxThrottleTime = 0;
this.directiveName = this.constructor.name;
}
/**
* @return {?}
*/
ngOnInit() {
if (isPlatformServer(this.platformId))
return;
// Initing parallax effect and setting element styles
this.initParallax();
this.setParallaxElTransform();
this.setParallaxTransition();
}
/**
* @param {?} changes
* @return {?}
*/
ngOnChanges(changes) {
// Setting parallax options from config object or input props
/** @type {?} */
const prlxSpeed = (changes['parallaxSpeed'] && changes['parallaxSpeed'].currentValue) ||
(changes['config'] && changes['config'].currentValue.parallaxSpeed);
/** @type {?} */
const prlxSmoothness = (changes['parallaxSmoothness'] && changes['parallaxSmoothness'].currentValue) ||
(changes['config'] && changes['config'].currentValue.parallaxSmoothness);
/** @type {?} */
const prlxDirection = (changes['parallaxDirection'] && changes['parallaxDirection'].currentValue) ||
(changes['config'] && changes['config'].currentValue.parallaxDirection);
/** @type {?} */
const prlxTimingFunction = (changes['parallaxTimingFunction'] && changes['parallaxTimingFunction'].currentValue) ||
(changes['config'] && changes['config'].currentValue.parallaxTimingFunction);
/** @type {?} */
const prlxThrottleTime = (changes['parallaxThrottleTime'] && changes['parallaxThrottleTime'].currentValue) ||
(changes['config'] && changes['config'].currentValue.parallaxThrottleTime);
this.setParallaxSpeed(prlxSpeed);
this.setParallaxSmoothness(prlxSmoothness);
this.setParallaxDirection(prlxDirection);
this.setParallaxTimingFun(prlxTimingFunction);
this.setParallaxThrottleTime(prlxThrottleTime);
}
/**
* @return {?}
*/
ngAfterViewInit() { }
/**
* @return {?}
*/
ngOnDestroy() {
this.scrollSubscribtion && this.scrollSubscribtion.unsubscribe();
}
// Setting parallax effect and setting element styles
/**
* @return {?}
*/
initParallax() {
this.scrollSubscribtion = fromEvent(window, 'scroll')
.pipe(throttleTime(this.prlxThrottleTime))
.subscribe((/**
* @return {?}
*/
() => {
this.setParallaxElTransform();
}));
}
// Setting parallax speed effect styles
/**
* @return {?}
*/
setParallaxElTransform() {
/** @type {?} */
let scrolled = window.pageYOffset;
this.renderer.setStyle(this.elem.nativeElement, 'transform', `translateY(${scrolled * this.prlxSpeed}px) translateZ(0)`);
}
// Setting parallax smooth effect styles, based on CSS animation-timing-function
/**
* @return {?}
*/
setParallaxTransition() {
this.renderer.setStyle(this.elem.nativeElement, 'transition', `transform ${this.prlxSmoothness}s ${this.prlxTimingFun}`);
}
// Setting parallax properties
/**
* @param {?} speedVal
* @return {?}
*/
setParallaxSpeed(speedVal) {
/** @type {?} */
const propName = 'parallaxSpeed';
this.validateParallaxSpeed(speedVal, propName, 'number') && (this._parallaxSpeedVal = speedVal);
}
/**
* @param {?} smoothnessVal
* @return {?}
*/
setParallaxSmoothness(smoothnessVal) {
/** @type {?} */
const propName = 'parallaxSmoothness';
this.validateParallaxSmoothness(smoothnessVal, propName, 'number') &&
(this._parallaxSmoothnessVal = smoothnessVal);
}
/**
* @param {?} directionVal
* @return {?}
*/
setParallaxDirection(directionVal) {
/** @type {?} */
const propName = 'parallaxDirection';
directionVal &&
this.isTypeOf(directionVal, 'string', propName) &&
directionVal === 'reverse' &&
(this._parallaxSpeedVal *= -1);
}
/**
* @param {?} timingFun
* @return {?}
*/
setParallaxTimingFun(timingFun) {
/** @type {?} */
const propName = 'parallaxTimingFunction';
timingFun &&
this.isTypeOf(timingFun, 'string', propName) &&
(this._parallaxTimingFunVal = timingFun);
}
/**
* @param {?} throttleTime
* @return {?}
*/
setParallaxThrottleTime(throttleTime) {
/** @type {?} */
const propName = 'parallaxThrottleTime';
throttleTime &&
this.isTypeOf(throttleTime, 'number', propName) &&
(this._parallaxThrottleTime = throttleTime);
}
// Getters for parallax options
/**
* @return {?}
*/
get prlxSpeed() {
return this._parallaxSpeedVal;
}
/**
* @return {?}
*/
get prlxSmoothness() {
return this._parallaxSmoothnessVal;
}
/**
* @return {?}
*/
get prlxTimingFun() {
return this._parallaxTimingFunVal;
}
/**
* @return {?}
*/
get prlxThrottleTime() {
return this._parallaxThrottleTime;
}
// Validation functions
/**
* @param {?} value
* @param {?} propName
* @return {?}
*/
isProvided(value, propName) {
/** @type {?} */
const isNotProvided = value == null || value === '';
if (isNotProvided && isDevMode()) {
throw new Error(`${this.directiveName}: [${propName}] is required, but was not provided`);
}
return true;
}
/**
* @param {?} value
* @param {?} requiredType
* @param {?} propName
* @return {?}
*/
isTypeOf(value, requiredType, propName) {
/** @type {?} */
const isRequiredType = typeof value === requiredType;
if (!isRequiredType && isDevMode()) {
throw new Error(`${this.directiveName}: [${propName}] is expected to be of type '${requiredType}', but type '${typeof value}' was provided`);
}
return true;
}
/**
* @param {?} value
* @param {?} propName
* @return {?}
*/
isPositive(value, propName) {
/** @type {?} */
const isRequiredType = typeof value === 'number';
/** @type {?} */
const isValid = value >= 0;
if (isRequiredType && !isValid && isDevMode()) {
throw new Error(`${this.directiveName}: [${propName}] is expected to be positive value, but negative '${value}' value was provided`);
}
return true;
}
// Executing validation functions to validate parallax speed
/**
* @param {?} value
* @param {?} propName
* @param {?} requiredType
* @return {?}
*/
validateParallaxSpeed(value, propName, requiredType) {
return (this.isProvided(value, propName) &&
this.isTypeOf(value, requiredType, propName) &&
this.isPositive(value, propName));
}
// Executing validation functions to validate parallax smoothness
/**
* @param {?} value
* @param {?} propName
* @param {?} requiredType
* @return {?}
*/
validateParallaxSmoothness(value, propName, requiredType) {
return (this.isProvided(value, propName) &&
this.isTypeOf(value, requiredType, propName) &&
this.isPositive(value, propName));
}
}
ParallaxScrollDirective.decorators = [
{ type: Directive, args: [{
selector: '[ngxParallaxScroll]'
},] }
];
/** @nocollapse */
ParallaxScrollDirective.ctorParameters = () => [
{ type: ElementRef },
{ type: Renderer2 },
{ type: Object, decorators: [{ type: Inject, args: [PLATFORM_ID,] }] }
];
ParallaxScrollDirective.propDecorators = {
config: [{ type: Input }],
parallaxSpeed: [{ type: Input }],
parallaxSmoothness: [{ type: Input }],
parallaxDirection: [{ type: Input }],
parallaxTimingFunction: [{ type: Input }],
parallaxThrottleTime: [{ type: Input }]
};
if (false) {
/**
* @type {?}
* @private
*/
ParallaxScrollDirective.prototype.config;
/** @type {?} */
ParallaxScrollDirective.prototype.parallaxSpeed;
/** @type {?} */
ParallaxScrollDirective.prototype.parallaxSmoothness;
/** @type {?} */
ParallaxScrollDirective.prototype.parallaxDirection;
/** @type {?} */
ParallaxScrollDirective.prototype.parallaxTimingFunction;
/** @type {?} */
ParallaxScrollDirective.prototype.parallaxThrottleTime;
/**
* @type {?}
* @private
*/
ParallaxScrollDirective.prototype._parallaxSpeedVal;
/**
* @type {?}
* @private
*/
ParallaxScrollDirective.prototype._parallaxSmoothnessVal;
/**
* @type {?}
* @private
*/
ParallaxScrollDirective.prototype._parallaxTimingFunVal;
/**
* @type {?}
* @private
*/
ParallaxScrollDirective.prototype._parallaxThrottleTime;
/** @type {?} */
ParallaxScrollDirective.prototype.scrollSubscribtion;
/** @type {?} */
ParallaxScrollDirective.prototype.isPrxElInViewport;
/** @type {?} */
ParallaxScrollDirective.prototype.directiveName;
/** @type {?} */
ParallaxScrollDirective.prototype.elem;
/** @type {?} */
ParallaxScrollDirective.prototype.renderer;
/**
* @type {?}
* @private
*/
ParallaxScrollDirective.prototype.platformId;
}
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{\n  Directive,\n  ElementRef,\n  Renderer2,\n  Input,\n  OnInit,\n  AfterViewInit,\n  OnChanges,\n  SimpleChanges,\n  OnDestroy,\n  Inject,\n  PLATFORM_ID\n} from '@angular/core';\nimport { isDevMode } from '@angular/core';\nimport { isPlatformServer } from '@angular/common';\nimport { fromEvent, Subscription } from 'rxjs';\nimport { throttleTime } from 'rxjs/operators';\nimport { IParallaxScrollConfig, ParallaxDirection } from './ngx-parallax.interfaces';\n\n@Directive({\n  selector: '[ngxParallaxScroll]'\n})\nexport class ParallaxScrollDirective implements OnInit, OnChanges, AfterViewInit, OnDestroy {\n  // Required input from config object or input props\n  @Input() private config?: IParallaxScrollConfig;\n\n  @Input()\n  parallaxSpeed: number;\n\n  @Input()\n  parallaxSmoothness: number;\n\n  @Input()\n  parallaxDirection?: ParallaxDirection;\n\n  @Input()\n  parallaxTimingFunction?: string;\n\n  @Input()\n  parallaxThrottleTime?: number;\n\n  // Setting the values after validation\n  private _parallaxSpeedVal: number;\n  private _parallaxSmoothnessVal: number;\n  private _parallaxTimingFunVal: string = 'linear';\n  private _parallaxThrottleTime: number = 0;\n\n  scrollSubscribtion: Subscription;\n  isPrxElInViewport: boolean;\n  directiveName: string = this.constructor.name;\n\n  constructor(\n    public elem: ElementRef,\n    public renderer: Renderer2,\n    @Inject(PLATFORM_ID) private platformId: Object\n  ) {}\n\n  ngOnInit() {\n    if (isPlatformServer(this.platformId)) return;\n\n    // Initing parallax effect and setting element styles\n    this.initParallax();\n    this.setParallaxElTransform();\n    this.setParallaxTransition();\n  }\n\n  ngOnChanges(changes: SimpleChanges) {\n    // Setting parallax options from config object or input props\n    const prlxSpeed =\n      (changes['parallaxSpeed'] && changes['parallaxSpeed'].currentValue) ||\n      (changes['config'] && changes['config'].currentValue.parallaxSpeed);\n\n    const prlxSmoothness =\n      (changes['parallaxSmoothness'] && changes['parallaxSmoothness'].currentValue) ||\n      (changes['config'] && changes['config'].currentValue.parallaxSmoothness);\n\n    const prlxDirection =\n      (changes['parallaxDirection'] && changes['parallaxDirection'].currentValue) ||\n      (changes['config'] && changes['config'].currentValue.parallaxDirection);\n\n    const prlxTimingFunction =\n      (changes['parallaxTimingFunction'] && changes['parallaxTimingFunction'].currentValue) ||\n      (changes['config'] && changes['config'].currentValue.parallaxTimingFunction);\n\n    const prlxThrottleTime =\n      (changes['parallaxThrottleTime'] && changes['parallaxThrottleTime'].currentValue) ||\n      (changes['config'] && changes['config'].currentValue.parallaxThrottleTime);\n\n    this.setParallaxSpeed(prlxSpeed);\n    this.setParallaxSmoothness(prlxSmoothness);\n    this.setParallaxDirection(prlxDirection);\n    this.setParallaxTimingFun(prlxTimingFunction);\n    this.setParallaxThrottleTime(prlxThrottleTime);\n  }\n\n  ngAfterViewInit() {}\n\n  ngOnDestroy() {\n    this.scrollSubscribtion && this.scrollSubscribtion.unsubscribe();\n  }\n\n  // Setting parallax effect and setting element styles\n  initParallax(): void {\n    this.scrollSubscribtion = fromEvent(window, 'scroll')\n      .pipe(throttleTime(this.prlxThrottleTime))\n      .subscribe(() => {\n        this.setParallaxElTransform();\n      });\n  }\n\n  // Setting parallax speed effect styles\n  setParallaxElTransform(): void {\n    let scrolled = window.pageYOffset;\n    this.renderer.setStyle(\n      this.elem.nativeElement,\n      'transform',\n      `translateY(${scrolled * this.prlxSpeed}px) translateZ(0)`\n    );\n  }\n\n  // Setting parallax smooth effect styles, based on CSS animation-timing-function\n  setParallaxTransition() {\n    this.renderer.setStyle(\n      this.elem.nativeElement,\n      'transition',\n      `transform ${this.prlxSmoothness}s ${this.prlxTimingFun}`\n    );\n  }\n\n  // Setting parallax properties\n  setParallaxSpeed(speedVal: any): void {\n    const propName = 'parallaxSpeed';\n    this.validateParallaxSpeed(speedVal, propName, 'number') && (this._parallaxSpeedVal = speedVal);\n  }\n\n  setParallaxSmoothness(smoothnessVal: any): void {\n    const propName = 'parallaxSmoothness';\n    this.validateParallaxSmoothness(smoothnessVal, propName, 'number') &&\n      (this._parallaxSmoothnessVal = smoothnessVal);\n  }\n\n  setParallaxDirection(directionVal: any): void {\n    const propName = 'parallaxDirection';\n    directionVal &&\n      this.isTypeOf(directionVal, 'string', propName) &&\n      directionVal === 'reverse' &&\n      (this._parallaxSpeedVal *= -1);\n  }\n\n  setParallaxTimingFun(timingFun: any): void {\n    const propName = 'parallaxTimingFunction';\n    timingFun &&\n      this.isTypeOf(timingFun, 'string', propName) &&\n      (this._parallaxTimingFunVal = timingFun);\n  }\n\n  setParallaxThrottleTime(throttleTime: any): void {\n    const propName = 'parallaxThrottleTime';\n    throttleTime &&\n      this.isTypeOf(throttleTime, 'number', propName) &&\n      (this._parallaxThrottleTime = throttleTime);\n  }\n\n  // Getters for parallax options\n  get prlxSpeed() {\n    return this._parallaxSpeedVal;\n  }\n\n  get prlxSmoothness() {\n    return this._parallaxSmoothnessVal;\n  }\n\n  get prlxTimingFun() {\n    return this._parallaxTimingFunVal;\n  }\n\n  get prlxThrottleTime() {\n    return this._parallaxThrottleTime;\n  }\n\n  // Validation functions\n  isProvided(value: any, propName: string): boolean {\n    const isNotProvided = value == null || value === '';\n    if (isNotProvided && isDevMode()) {\n      throw new Error(\n        `${this.directiveName}: @Input [${propName}] is required, but was not provided`\n      );\n    }\n    return true;\n  }\n\n  isTypeOf(value: any, requiredType: 'string' | 'number' | 'boolean', propName: string): boolean {\n    const isRequiredType = typeof value === requiredType;\n    if (!isRequiredType && isDevMode()) {\n      throw new Error(\n        `${\n          this.directiveName\n        }: @Input [${propName}] is expected to be of type '${requiredType}', but type '${typeof value}' was provided`\n      );\n    }\n    return true;\n  }\n\n  isPositive(value: number, propName: string): boolean {\n    const isRequiredType = typeof value === 'number';\n    const isValid = value >= 0;\n\n    if (isRequiredType && !isValid && isDevMode()) {\n      throw new Error(\n        `${\n          this.directiveName\n        }: @Input [${propName}] is expected to be positive value, but negative '${value}' value was provided`\n      );\n    }\n    return true;\n  }\n\n  // Executing validation functions to validate parallax speed\n  validateParallaxSpeed(\n    value: any,\n    propName: string,\n    requiredType: 'string' | 'number' | 'boolean'\n  ) {\n    return (\n      this.isProvided(value, propName) &&\n      this.isTypeOf(value, requiredType, propName) &&\n      this.isPositive(value, propName)\n    );\n  }\n\n  // Executing validation functions to validate parallax smoothness\n  validateParallaxSmoothness(\n    value: any,\n    propName: string,\n    requiredType: 'string' | 'number' | 'boolean'\n  ) {\n    return (\n      this.isProvided(value, propName) &&\n      this.isTypeOf(value, requiredType, propName) &&\n      this.isPositive(value, propName)\n    );\n  }\n}\n"]}